BellringerBellringer Add the following definition to your Add the following definition to your

vocabulary list in your journal:vocabulary list in your journal:

Natural selection:Natural selection: A mechanism of A mechanism of evolution in which biological traits evolution in which biological traits are kept or not to allow for better are kept or not to allow for better adaptation to the environment and adaptation to the environment and fitnessfitness

(recall adaptation and fitness)*(recall adaptation and fitness)*

Unit 2: Modeling Unit 2: Modeling Natural SelectionNatural Selection

Ms. LiuMs. Liu

10/12/1110/12/11

Today, we’re going Today, we’re going hunting!!hunting!!

Roles/PlayersRoles/Players Write down Team # and the fabric colorWrite down Team # and the fabric color

In teams of 4, designated roles and write In teams of 4, designated roles and write down name next to role on sheet:down name next to role on sheet:– The wardenThe warden

– Hunter 1Hunter 1

– Hunter 2Hunter 2

– Hunter 3Hunter 3

DirectionsDirections

Open up book to p. 52 and read “Modeling Open up book to p. 52 and read “Modeling Natural SelectionNatural Selection

Count out Count out 10 dots10 dots for each color on your for each color on your white paperwhite paper

Record the colors of dots and that number Record the colors of dots and that number of starting population on your data sheetof starting population on your data sheet

Then spread out all the dots you counted Then spread out all the dots you counted out on your fabric evenlyout on your fabric evenly

Now We hunt! Now We hunt! HUNT #1HUNT #1

Warden – Keep track of time, allow Warden – Keep track of time, allow 20 sec20 sec for hunting for hunting

All huntersAll hunters– Pick up dots 1 by 1Pick up dots 1 by 1– Using only 1 hand for 20 secUsing only 1 hand for 20 sec

Record dataRecord data

Each hunter Each hunter – Record the number of dots for each Record the number of dots for each

colorcolor– Share your data with your teamShare your data with your team

Warden Warden – collect the remaining dots on the fabriccollect the remaining dots on the fabric– For EVERY remaining dot, add 3 more For EVERY remaining dot, add 3 more

(these are offspring)(these are offspring)

HUNT #2HUNT #2

Repeat Hunt:Repeat Hunt:

Warden – keeps time for 20 secWarden – keeps time for 20 sec

Hunters – pick up dots 1 by 1 for Hunters – pick up dots 1 by 1 for 20 sec20 sec

HUNT #3HUNT #3Repeat:Repeat:

– Record dataRecord data– Add 3 dots for every remaining dot Add 3 dots for every remaining dot

on fabricon fabric

Repeat hunt:Repeat hunt:– Warden keeps time for 20 secWarden keeps time for 20 sec– Hunters – pick up dots 1 by 1 for 20 Hunters – pick up dots 1 by 1 for 20

secsec